[llvm-bugs] [Bug 46831] New: isGuaranteedNotToBeUndefOrPoison - ASSERT: Val && "isa<> used on a null pointer"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46831

            Bug ID: 46831
           Summary: isGuaranteedNotToBeUndefOrPoison  - ASSERT: Val &&
                    "isa<> used on a null pointer"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: juneyoung.lee at sf.snu.ac.kr, llvm-bugs at lists.llvm.org,
                    nikita.ppv at gmail.com, spatel+llvm at rotateright.com

Reduced from: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24278

define void @OSSFuzz24278() {
entry:
  %B9 = sdiv i16 -32768, 256
  %L3 = load i64, i64* undef, align 4
  %B3 = sub i16 0, %B9
  %i = insertelement <4 x i16> undef, i16 %B3, i32 3
  %i1 = sub <4 x i16> zeroinitializer, %i
  %i2 = sext <4 x i16> %i1 to <4 x i32>
  %i3 = getelementptr inbounds i64, i64* null, <4 x i32> %i2
  %I6 = insertelement <4 x i64*> %i3, i64* undef, i64 %L3
  ret void
}

opt -gvn -mtriple=x86_64--

opt: /home/simon/LLVM/llvm-project/llvm/include/llvm/Support/Casting.h:104:
static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To =
llvm::UndefValue; From = llvm::Constant]: Assertion `Val && "isa<> used on a
null pointer"' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
0.      Program arguments: opt -gvn fuzz24278.ll -S -o -
1.      Running pass 'Function Pass Manager' on module 'fuzz24278.ll'.
2.      Running pass 'Global Value Numbering' on function '@PR38984'
opt(_ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamE+0x2a)[0x7f5220f4e19a]
opt(_ZN4llvm3sys17RunSignalHandlersEv+0x34)[0x7f5220f4bf94]
opt(+0x294c975)[0x7f5220f4c975]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12890)[0x7f521dff2890]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7f521d0bee97]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x141)[0x7f521d0c0801]
/lib/x86_64-linux-gnu/libc.so.6(+0x3039a)[0x7f521d0b039a]
/lib/x86_64-linux-gnu/libc.so.6(+0x30412)[0x7f521d0b0412]
opt(+0x212c263)[0x7f522072c263]
opt(+0x213f0f6)[0x7f522073f0f6]
opt(_ZN4llvm32isGuaranteedNotToBeUndefOrPoisonEPKNS_5ValueEPKNS_11InstructionEPKNS_13DominatorTreeEj+0xcc)[0x7f5220205e1c]
opt(_ZN4llvm25SimplifyInsertElementInstEPNS_5ValueES1_S1_RKNS_13SimplifyQueryE+0x11e)[0x7f522008496e]
opt(_ZN4llvm19SimplifyInstructionEPNS_11InstructionERKNS_13SimplifyQueryEPNS_25OptimizationRemarkEmitterE+0x2b6)[0x7f5220096826]

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